/*******************************************************************************

Data East machine functions - Bryan McPhail, mish@tendril.co.uk

* Control reads, protection chip emulations & cycle skipping patches

*******************************************************************************/

#include "driver.h"
#include "dec0.h"
#include "cpu/h6280/h6280.h"

static int GAME,i8751_return,slyspy_state;

/******************************************************************************/

READ16_HANDLER( dec0_controls_r )
{
	switch (offset<<1)
	{
		case 0: /* Player 1 & 2 joystick & buttons */
			return (readinputport(0) + (readinputport(1) << 8));

		case 2: /* Credits, start buttons */
			return readinputport(2);

		case 4: /* Byte 4: Dipswitch bank 2, Byte 5: Dipswitch Bank 1 */
			return (readinputport(3) + (readinputport(4) << 8));

		case 8: /* Intel 8751 mc, Bad Dudes & Heavy Barrel only */
			return i8751_return;
	}

	log_cb(RETRO_LOG_DEBUG, LOGPRE "CPU #0 PC %06x: warning - read unmapped memory address %06x\n",activecpu_get_pc(),0x30c000+offset);
	return ~0;
}

/******************************************************************************/

READ16_HANDLER( dec0_rotary_r )
{
	switch (offset<<1)
	{
		case 0: /* Player 1 rotary */
			return ~(1 << (readinputport(5) * 12 / 256));

		case 8: /* Player 2 rotary */
			return ~(1 << (readinputport(6) * 12 / 256));

		default:
			log_cb(RETRO_LOG_DEBUG, LOGPRE "Unknown rotary read at 300000 %02x\n",offset);
	}

	return 0;
}

/******************************************************************************/

READ16_HANDLER( midres_controls_r )
{
	switch (offset<<1)
	{
		case 0: /* Player 1 Joystick + start, Player 2 Joystick + start */
			return (readinputport(0) + (readinputport(1) << 8));

		case 2: /* Dipswitches */
			return (readinputport(3) + (readinputport(4) << 8));

		case 4: /* Player 1 rotary */
			return ~(1 << (readinputport(5) * 12 / 256));

		case 6: /* Player 2 rotary */
			return ~(1 << (readinputport(6) * 12 / 256));

		case 8: /* Credits, start buttons */
			return readinputport(2);

		case 12:
			return 0;	/* ?? watchdog ?? */
	}

	log_cb(RETRO_LOG_DEBUG, LOGPRE "PC %06x unknown control read at %02x\n",activecpu_get_pc(),0x180000+offset);
	return ~0;
}

/******************************************************************************/

READ16_HANDLER( slyspy_controls_r )
{
	switch (offset<<1)
	{
		case 0: /* Dip Switches */
			return (readinputport(3) + (readinputport(4) << 8));

		case 2: /* Player 1 & Player 2 joysticks & fire buttons */
			return (readinputport(0) + (readinputport(1) << 8));

		case 4: /* Credits */
			return readinputport(2);
	}

	log_cb(RETRO_LOG_DEBUG, LOGPRE "Unknown control read at 30c000 %d\n",offset);
	return ~0;
}

READ16_HANDLER( slyspy_protection_r )
{
	/* These values are for Boulderdash, I have no idea what they do in Slyspy */
	switch (offset<<1) {
		case 0: 	return 0;
		case 2: 	return 0x13;
		case 4:		return 0;
		case 6:		return 0x2;
	}

	log_cb(RETRO_LOG_DEBUG, LOGPRE "%04x, Unknown protection read at 30c000 %d\n",activecpu_get_pc(),offset);
	return 0;
}

/*
	The memory map in Sly Spy can change between 4 states according to the protection!

	Default state (called by Traps 1, 3, 4, 7, C)

	240000 - 24001f = control   (Playfield 2 area)
	242000 - 24207f = colscroll
	242400 - 2425ff = rowscroll
	246000 - 2467ff = data

	248000 - 24801f = control  (Playfield 1 area)
	24c000 - 24c07f = colscroll
	24c400 - 24c4ff = rowscroll
	24e000 - 24e7ff = data

	State 1 (Called by Trap 9) uses this memory map:

	248000 = pf1 data
	24c000 = pf2 data

	State 2 (Called by Trap A) uses this memory map:

	240000 = pf2 data
	242000 = pf1 data
	24e000 = pf1 data

	State 3 (Called by Trap B) uses this memory map:

	240000 = pf1 data
	248000 = pf2 data

*/

WRITE16_HANDLER( slyspy_state_w )
{
	slyspy_state=0;
}

READ16_HANDLER( slyspy_state_r )
{
	slyspy_state++;
	slyspy_state=slyspy_state%4;
	return 0; /* Value doesn't mater */
}

WRITE16_HANDLER( slyspy_240000_w )
{
	switch (slyspy_state) {
		case 0x3:
			dec0_pf1_data_w(offset,data,mem_mask);
			return;
		case 0x2:
			dec0_pf2_data_w(offset,data,mem_mask);
			return;
		case 0x0:
			if (offset<0x8) dec0_pf2_control_0_w(offset,data,mem_mask);
			else if (offset<0x10) dec0_pf2_control_1_w(offset-0x8,data,mem_mask);
			return;
	}
	log_cb(RETRO_LOG_DEBUG, LOGPRE "Wrote to 240000 %02x at %04x %04x (Trap %02x)\n",offset,activecpu_get_pc(),data,slyspy_state);
}

WRITE16_HANDLER( slyspy_242000_w )
{
	switch (slyspy_state) {
		case 0x2: /* Trap A */
			dec0_pf1_data_w(offset,data,mem_mask);
			return;
		case 0x0: /* Trap C */
			if (offset<0x40) COMBINE_DATA(&dec0_pf2_colscroll[offset]);
			else if (offset<0x300) COMBINE_DATA(&dec0_pf2_rowscroll[offset-0x200]);
			return;
	}
	log_cb(RETRO_LOG_DEBUG, LOGPRE "Wrote to 242000 %02x at %04x %04x (Trap %02x)\n",offset,activecpu_get_pc(),data,slyspy_state);
}

WRITE16_HANDLER( slyspy_246000_w )
{
	switch (slyspy_state) {
		case 0x0:
			dec0_pf2_data_w(offset,data,mem_mask);
			return;
	}
	log_cb(RETRO_LOG_DEBUG, LOGPRE "Wrote to 246000 %02x at %04x %04x (Trap %02x)\n",offset,activecpu_get_pc(),data,slyspy_state);
}

WRITE16_HANDLER( slyspy_248000_w )
{
	switch (slyspy_state) {
		case 0x1:
			dec0_pf1_data_w(offset,data,mem_mask);
			return;
		case 0x3:
			dec0_pf2_data_w(offset,data,mem_mask);
			return;
		case 0x0:
			if (offset<0x8) dec0_pf1_control_0_w(offset,data,mem_mask);
			else if (offset<0x10) dec0_pf1_control_1_w(offset-0x8,data,mem_mask);
			return;
	}
	log_cb(RETRO_LOG_DEBUG, LOGPRE "Wrote to 248000 %02x at %04x %04x (Trap %02x)\n",offset,activecpu_get_pc(),data,slyspy_state);
}

WRITE16_HANDLER( slyspy_24c000_w )
{
	switch (slyspy_state) {
		case 0x1: /* Trap 9 */
			dec0_pf2_data_w(offset,data,mem_mask);
			return;
		case 0x0: /* Trap C */
			if (offset<0x40) COMBINE_DATA(&dec0_pf1_colscroll[offset]);
			else if (offset<0x300) COMBINE_DATA(&dec0_pf1_rowscroll[offset-0x200]);
			return;
	}
	log_cb(RETRO_LOG_DEBUG, LOGPRE "Wrote to 24c000 %02x at %04x %04x (Trap %02x)\n",offset,activecpu_get_pc(),data,slyspy_state);
}

WRITE16_HANDLER( slyspy_24e000_w )
{
	switch (slyspy_state) {
		case 0x2:
		case 0x0:
			dec0_pf1_data_w(offset,data,mem_mask);
			return;
	}
	log_cb(RETRO_LOG_DEBUG, LOGPRE "Wrote to 24e000 %02x at %04x %04x (Trap %02x)\n",offset,activecpu_get_pc(),data,slyspy_state);
}

/******************************************************************************/

static int share[0xff];
static int hippodrm_msb,hippodrm_lsb;

READ_HANDLER( hippodrm_prot_r )
{
/*logerror("6280 PC %06x - Read %06x\n",cpu_getpc(),offset+0x1d0000);*/
	if (hippodrm_lsb==0x45) return 0x4e;
	if (hippodrm_lsb==0x92) return 0x15;
	return 0;
}

WRITE_HANDLER( hippodrm_prot_w )
{
	switch (offset) {
		case 4:	hippodrm_msb=data; break;
		case 5:	hippodrm_lsb=data; break;
	}
/*logerror("6280 PC %06x - Wrote %06x to %04x\n",cpu_getpc(),data,offset+0x1d0000);*/
}

READ_HANDLER( hippodrm_shared_r )
{
	return share[offset];
}

WRITE_HANDLER( hippodrm_shared_w )
{
	share[offset]=data;
}

static READ16_HANDLER( hippodrm_68000_share_r )
{
	if (offset==0) cpu_yield(); /* A wee helper */
	return share[offset]&0xff;
}

static WRITE16_HANDLER( hippodrm_68000_share_w )
{
	share[offset]=data&0xff;
}

/******************************************************************************/

static void hbarrel_i8751_write(int data)
{
	static int level,state;

	const int title[]={  1, 2, 5, 6, 9,10,13,14,17,18,21,22,25,26,29,30,33,34,37,38,41,42,0,
                 3, 4, 7, 8,11,12,15,16,19,20,23,24,27,28,31,32,35,36,39,40,43,44,0,
                45,46,49,50,53,54,57,58,61,62,65,66,69,70,73,74,77,78,81,82,0,
                47,48,51,52,55,56,59,60,63,64,67,68,71,72,75,76,79,80,83,84,0,
                85,86,89,90,93,94,97,98,101,102,105,106,109,110,113,114,117,118,121,122,125,126,0,
                87,88,91,92,95,96,99,100,103,104,107,108,111,112,115,116,119,120,123,124,127,128,0,
                129,130,133,134,137,138,141,142,145,146,149,150,153,154,157,158,161,162,165,166,169,170,173,174,0,
                131,132,135,136,139,140,143,144,147,148,151,152,155,156,159,160,163,164,167,168,171,172,175,176,0,
                0x10b1,0x10b2,0,0x10b3,0x10b4,-1
	};

	/* This table is from the USA version - others could be different.. */
	const int weapons_table[][0x20]={
		{ 0x558,0x520,0x5c0,0x600,0x520,0x540,0x560,0x5c0,0x688,0x688,0x7a8,0x850,0x880,0x880,0x990,0x9b0,0x9b0,0x9e0,0xffff }, /* Level 1 */
		{ 0x330,0x370,0x3d8,0x580,0x5b0,0x640,0x6a0,0x8e0,0x8e0,0x940,0x9f0,0xa20,0xa50,0xa80,0xffff }, /* Level 2 */
		{ 0xb20,0xbd0,0xb20,0xb20,0xbd8,0xb50,0xbd8,0xb20,0xbe0,0xb40,0xb80,0xa18,0xa08,0xa08,0x980,0x8e0,0x780,0x790,0x650,0x600,0x5d0,0x5a0,0x570,0x590,0x5e0,0xffff }, /* Level 3 */
		{ 0x530,0x5d0,0x5e0,0x5c8,0x528,0x520,0x5d8,0x5e0,0x5d8,0x540,0x570,0x5a0,0x658,0x698,0x710,0x7b8,0x8e0,0x8e0,0x8d8,0x818,0x8e8,0x820,0x8e0,0x848,0x848,0xffff }, /* Level 4 */
		{ 0x230,0x280,0x700,0x790,0x790,0x7e8,0x7e8,0x8d0,0x920,0x950,0xad0,0xb90,0xb50,0xb10,0xbe0,0xbe0,0xffff }, /* Level 5 */
		{ 0xd20,0xde0,0xd20,0xde0,0xd80,0xd80,0xd90,0xdd0,0xdb0,0xb20,0xa40,0x9e0,0x960,0x8a0,0x870,0x840,0x7e0,0x7b0,0x780,0xffff }, /* Level 6 */
		{ 0x730,0x7e0,0x720,0x7e0,0x740,0x7c0,0x730,0x7d0,0x740,0x7c0,0x730,0x7d0,0x720,0x7e0,0x720,0x7e0,0x720,0x7e0,0x720,0x7e0,0x730,0x7d0,0xffff } /* Level 7 */
	};

	switch (data>>8) {
		case 0x2:	/* Selects level */
			i8751_return=level;
			break;
		case 0x3:	/* Increment level counter */
			level++;
			i8751_return=0x301;
			break;
		case 0x5:	/* Set level 0 */
			i8751_return=0xb3b;
			level=0;
			break;
		case 0x06:	/* Controls appearance & placement of special weapons */
			i8751_return=weapons_table[level][data&0x1f];
			/*logerror("CPU #0 PC %06x: warning - write %02x to i8751, returning %04x\n",activecpu_get_pc(),data,i8751_return);*/
			break;
		case 0xb:	/* Initialise the variables? */
			i8751_return=0;
			break;
		default:
			i8751_return=0;
	}

	/* Protection */
	if (data==7) i8751_return=0xc000; /* Stack pointer */
	if (data==0x175) i8751_return=0x68b; /* ID check - USA version */
	if (data==0x174) i8751_return=0x68c; /* ID check - World version */

	/* All commands in range 4xx are related to title screen.. */
	if (data==0x4ff) state=0;
	if (data>0x3ff && data<0x4ff) {
		state++;

		if (title[state-1]==0) i8751_return=0xfffe;
		else if (title[state-1]==-1) i8751_return=0xffff;
		else if (title[state-1]>0x1000) i8751_return=(title[state-1]&0xfff)+128+15;
		else i8751_return=title[state-1]+128+15+0x2000;

		/* We have to use a state as the microcontroller remembers previous commands */
	}

/*logerror("CPU #0 PC %06x: warning - write %02x to i8751\n",activecpu_get_pc(),data);*/
}

static void baddudes_i8751_write(int data)
{
	i8751_return=0;

	switch (data&0xffff) {
		case 0x714: i8751_return=0x700; break;
		case 0x73b: i8751_return=0x701; break;
		case 0x72c: i8751_return=0x702; break;
		case 0x73f: i8751_return=0x703; break;
		case 0x755: i8751_return=0x704; break;
		case 0x722: i8751_return=0x705; break;
		case 0x72b: i8751_return=0x706; break;
		case 0x724: i8751_return=0x707; break;
		case 0x728: i8751_return=0x708; break;
		case 0x735: i8751_return=0x709; break;
		case 0x71d: i8751_return=0x70a; break;
		case 0x721: i8751_return=0x70b; break;
		case 0x73e: i8751_return=0x70c; break;
		case 0x761: i8751_return=0x70d; break;
		case 0x753: i8751_return=0x70e; break;
		case 0x75b: i8751_return=0x70f; break;
	}

	if (!i8751_return) log_cb(RETRO_LOG_DEBUG, LOGPRE "%04x: warning - write unknown command %02x to 8571\n",activecpu_get_pc(),data);
}

static void birdtry_i8751_write(int data)
{
	static int 	pwr,
				hgt;

	i8751_return=0;

	switch(data&0xffff) {
		/*"Sprite control"*/
		case 0x22a:	i8751_return = 0x200;	  break;

		/* Gives an O.B. otherwise (it must be > 0xb0 )*/
		case 0x3c7:	i8751_return = 0x7ff;	  break;

		/*Enables shot checks*/
		case 0x33c: i8751_return = 0x200;     break;

		/*Used on the title screen only(???)*/
		case 0x31e: i8751_return = 0x200;     break;

/*  0x100-0x10d values are for club power meters(1W=0x100<<-->>PT=0x10d).    *
 *  Returned value to i8751 doesn't matter,but send the result to 0x481.     *
 *  Lower the value,stronger is the power.                                   */
		case 0x100: pwr = 0x30; 			break; /*1W*/
		case 0x101: pwr = 0x34; 			break; /*3W*/
		case 0x102: pwr = 0x38; 			break; /*4W*/
		case 0x103: pwr = 0x3c; 			break; /*1I*/
		case 0x104: pwr = 0x40; 			break; /*3I*/
		case 0x105: pwr = 0x44; 			break; /*4I*/
		case 0x106: pwr = 0x48; 			break; /*5I*/
		case 0x107: pwr = 0x4c; 			break; /*6I*/
		case 0x108: pwr = 0x50; 			break; /*7I*/
		case 0x109: pwr = 0x54; 			break; /*8I*/
		case 0x10a: pwr = 0x58; 			break; /*9I*/
		case 0x10b: pwr = 0x5c; 			break; /*PW*/
		case 0x10c: pwr = 0x60; 			break; /*SW*/
		case 0x10d: pwr = 0x80; 			break; /*PT*/
		case 0x481: i8751_return = pwr;     break; /*Power meter*/

/*  0x200-0x20f values are for shot height(STRONG=0x200<<-->>WEAK=0x20f).    *
 *  Returned value to i8751 doesn't matter,but send the result to 0x534.     *
 *  Higher the value,stronger is the height.                                 */
		case 0x200: hgt = 0x5c0;  			break; /*H*/
		case 0x201: hgt = 0x580; 			break; /*|*/
		case 0x202: hgt = 0x540; 			break; /*|*/
		case 0x203: hgt = 0x500; 			break; /*|*/
		case 0x204: hgt = 0x4c0; 			break; /*|*/
		case 0x205: hgt = 0x480; 			break; /*|*/
		case 0x206: hgt = 0x440; 			break; /*|*/
		case 0x207: hgt = 0x400; 			break; /*M*/
		case 0x208: hgt = 0x3c0; 			break; /*|*/
		case 0x209: hgt = 0x380; 			break; /*|*/
		case 0x20a: hgt = 0x340; 			break; /*|*/
		case 0x20b: hgt = 0x300; 			break; /*|*/
		case 0x20c: hgt = 0x2c0; 			break; /*|*/
		case 0x20d: hgt = 0x280; 			break; /*|*/
		case 0x20e: hgt = 0x240; 			break; /*|*/
		case 0x20f: hgt = 0x200; 			break; /*L*/
		case 0x534: i8751_return = hgt; 	break; /*Shot height*/

		/*At the ending screen(???)*/
		/*case 0x3b4: i8751_return = 0;		  break;*/

		/*These are activated after a shot (???)*/
		case 0x6ca: i8751_return = 0xff;      break;
		case 0x7ff: i8751_return = 0x200;     break;
		default: log_cb(RETRO_LOG_DEBUG, LOGPRE "%04x: warning - write unknown command %02x to 8571\n",activecpu_get_pc(),data);
	}
}

static void *i8751_timer;

static void i8751_callback(int param)
{
	/* Signal main cpu microcontroller task is complete */
	cpu_set_irq_line(0,5,HOLD_LINE);
	i8751_timer=NULL;

	log_cb(RETRO_LOG_DEBUG, LOGPRE "i8751:  Timer called!!!\n");
}

void dec0_i8751_write(int data)
{
	/* Writes to this address cause an IRQ to the i8751 microcontroller */
	if (GAME==1) hbarrel_i8751_write(data);
	if (GAME==2) baddudes_i8751_write(data);
	if (GAME==3) birdtry_i8751_write(data);

	cpu_set_irq_line(0,5,HOLD_LINE);

	/* Simulate the processing time of the i8751, time value is guessed
	if (i8751_timer)
		log_cb(RETRO_LOG_DEBUG, LOGPRE "i8751:  Missed a timer!!!\n");
	else
		i8751_timer = timer_set(TIME_NOW, 0, i8751_callback);*/

/* There is a timing problem in Heavy Barrel if the processing time is not
simulated - if the interrupt is triggered straight away then HB will reset
at the end of level one, the processing time needs to be at least the cycles
of a TST.W + BMI.S (ie, not very much at all).

See the code about 0xb60 (USA version)

*/

log_cb(RETRO_LOG_DEBUG, LOGPRE "CPU #0 PC %06x: warning - write %02x to i8751\n",activecpu_get_pc(),data);

}

void dec0_i8751_reset(void)
{
	i8751_return=0;
}

/******************************************************************************/

static WRITE16_HANDLER( sprite_mirror_w )
{
	extern data16_t *spriteram16;
	COMBINE_DATA(&spriteram16[offset]);
}

/******************************************************************************/

static READ16_HANDLER( robocop_68000_share_r )
{
/*logerror("%08x: Share read %04x\n",activecpu_get_pc(),offset);*/

	return robocop_shared_ram[offset];
}

static WRITE16_HANDLER( robocop_68000_share_w )
{
/*	log_cb(RETRO_LOG_DEBUG, LOGPRE "%08x: Share write %04x %04x\n",activecpu_get_pc(),offset,data);*/

	robocop_shared_ram[offset]=data&0xff;

	if (offset==0x7ff) /* A control address - not standard ram */
		cpu_set_irq_line(2,0,HOLD_LINE);
}

/******************************************************************************/

static void h6280_decrypt(int memory_area)
{
	int i;
	unsigned char *RAM = memory_region(memory_area);

	/* Read each byte, decrypt it */
	for (i=0x00000; i<0x10000; i++)
		RAM[i]=(RAM[i] & 0x7e) | ((RAM[i] & 0x1) << 7) | ((RAM[i] & 0x80) >> 7);
}

DRIVER_INIT( hippodrm )
{
	unsigned char *RAM = memory_region(REGION_CPU3);

	install_mem_read16_handler(0, 0x180000, 0x180fff, hippodrm_68000_share_r);
	install_mem_write16_handler(0, 0x180000, 0x180fff, hippodrm_68000_share_w);
	install_mem_write16_handler(0, 0xffc800, 0xffcfff, sprite_mirror_w);

	h6280_decrypt(REGION_CPU3);

	/* The protection cpu has additional memory mapped protection! */
	RAM[0x189]=0x60; /* RTS prot area */
	RAM[0x1af]=0x60; /* RTS prot area */
	RAM[0x1db]=0x60; /* RTS prot area */
	RAM[0x21a]=0x60; /* RTS prot area */
}

DRIVER_INIT( slyspy )
{
	unsigned char *RAM = memory_region(REGION_CPU2);

	h6280_decrypt(REGION_CPU2);

	/* Slyspy sound cpu has some protection */
	RAM[0xf2d]=0xea;
	RAM[0xf2e]=0xea;
}

DRIVER_INIT( robocop )
{
	install_mem_read16_handler( 0, 0x180000, 0x180fff, robocop_68000_share_r);
	install_mem_write16_handler(0, 0x180000, 0x180fff, robocop_68000_share_w);
}

DRIVER_INIT( baddudes )
{
	GAME=2;
}

DRIVER_INIT( hbarrel )
{
	GAME=1;
{ /* Remove this patch once processing time of i8751 is simulated */
data16_t *rom = (data16_t *)memory_region(REGION_CPU1);
rom[0xb68/2] = 0x8008;
}
}

DRIVER_INIT( hbarrelw )
{
	GAME=1;
{ /* Remove this patch once processing time of i8751 is simulated */
data16_t *rom = (data16_t *)memory_region(REGION_CPU1);
rom[0xb3e/2] = 0x8008;
}
}

DRIVER_INIT( birdtry )
{
	GAME=3;
}
